220 NORTH AMERICAN TRYPETINA. 



Of the size of T. eximia Wied., and so closely allied to it in 

 all the plastic characters, that their detailed description would be 

 superfluous. Head and all its parts of the same coloring and the 

 same structure as in that species, only the frontal bristles are 

 somewhat weaker. The thoracic dorsum shows a delicate middle 

 line, gradually fading anteriorly and expanding posteriorly into 

 a large spot, which does not entirely reach the posterior thoracic 

 margin, and is surrounded laterally and posteriorly by a blackish 

 coloring ; beginning at the shoulder, a sulphur-yellow stripe runs, 

 gradually expanding, to the root of the wing ; it emits, near the 

 humeral callus, an upper branch, running towards the transverse 

 suture ; between both branches, the color changes into brownish. 

 Pleurae brownish-black, with a sulphur-yellow longitudinal 

 stripe across the middle ; moreover, the sulphur-yellow stripe 

 between the humerus and the root of the wings, is prolonged under 

 the latter as far as the posterior end of the thorax. Scutellum 

 entirely of the same structure as in T. eximia, sulphur-yellow, at 

 the basis of the upper side with a large, semicircular brownish- 

 black spot, the border of the upper side only remaining sulphur- 

 yellow. Metathorax brownish-black, spotted with brown on the 

 sides, and with a yellow spot on the middle of its upper side. 

 The dense and very short pubescence of the thorax and the 

 scutellum is more whitish-yellow than is usually the case in T. 

 eximia ; otherwise the hairs and bristles of both species are alike 

 in their coloring ; the number and position of the macrochaetae is 

 the same in both. Abdomen with three very broad black cross- 

 bands, which lie on the second, third, and fourth segments, and 

 leave uncovered only the middle line and the posterior margin of 

 these segments. The pile on the abdomen is black; on the upper 

 side of the first segment and along the posterior border of the 

 second, pale-yellowish. Hypopygium brownish-black. Coxae 

 and feet yellow ; the intermediate femora towards the basis, 

 to a great, but variable extent, brownish-black; hind femora 

 black, somewhat yellow towards the end, especially on the under 

 side. The bristles on the femora and tibiae are almost as in 

 T. eximia. The shape of the wings, the venation, and the posi- 

 tion of the bristles are exactly as in that species ; the pattern 

 of the picture is likewise a somewhat similar one ; however, 

 it differs considerably in the details ; the bulk of the dark color- 

 ing extends a little beyond the small crossvein and is gently 



